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Utah law currently allows parents to seek up to four years of back child support when establishing paternity through court, but this bill reduces that window to one year. The bill also sets new deadlines for when a parentage action — a legal proceeding to officially establish who a child's parent is — can be filed: most people must file before the child turns 18, but the child themselves has until age 26 to bring such a claim. The bill also clarifies that parentage questions involving a presumed father can be raised before or during a divorce proceeding, subject to the same age limits.